Malicious PDF — malware analysis report

Static analysis result for SHA-256 066b4260b6b3bcd9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 16:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9bebb583849fdcfd36e1fa877c14c48a SHA-1: 6042663ad42c139b6f315b2d8f68468f82b54602 SHA-256: 066b4260b6b3bcd93417ffff11679ebb88e4831df10b434e9bd8ad567ab9f0a3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs, some hosted on compromised CMS platforms, suggesting it's designed to deliver a malicious payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document actively tries to trick the user into running commands, a common tactic for downloading and executing further malware. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=how+to+turn+on+safesearch+on+chrome PDF link annotation
    • http://a1-automotivegroup.com/upload/files/63455609607.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/gugamilipafan.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/34228350893.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8b15e1b6bff0b54a91f1c7da3d5ec0fb/fivitixupuzizulafonuboja.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090921472924814.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/zedin.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/95326050593.pdfIn PDF document text
    • http://air-ned.com/uploads/files/17231589944.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210901023525.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161314c2717cb3---783810361.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75498743362.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/6652200309.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/78833373787.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090510143173499.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa71cf4077---91387475180.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/kijisiwegemopugub.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/85520670519.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/77376901015.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/66474674695.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/57667315566.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/6748557370.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/daxilozapadixeva.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/segukegevato.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/bewugosogidibe.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/rigudixaxixofida.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10640 bytes
SHA-256: 8488962f4a3c533d17a89505ef4d3a1c1e0bd6fc96a00dc3875558483f940096
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 18136 bytes
SHA-256: e1ffa53bea2d1f92e4ad29cd5ac02789c2a50ee902b2dd3296d783fcb67cb1de

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